174 University of California Puhlications. [E>tomol(k:y 



North American Species — Continued. 



'1. Pronotum with a median brownish vitta vur'm n. sp. 



I'ronotum without such vitta lirgata Coquillett. 



:\ . Palpi blackish pulchrifrons Low. 



Palpi yellowish i 



4. Upper side of thorax with broad brown lateral stripe 



vittata Low. 



Upper side of thorax without such stripe 5 



."». Abdomen with irregular brownisli semifasciae. each formed 



by two spots carinata Low. 



Abdomen with two brown spots on each of the intermediate 



segments unicolor Low. 



Abdomen dull, but without brown spots avia Low. 



( ■) . Palpi blackish >ioUta Walker. 



Palpi reddish yellow erythrocera Low. 



Palpi light yellow helhila Willistou. 



7 . Palpi yellowish bella Low. 



Palpi blackish S 



8. Front with two black stripes separated by the ocellar triangle 



decoris Willistou. 



Front without such stripes '•' 



0. Hind metatarsi with a strong black bristle on the under side 



maciochaeta Low. 



Hind metatarsi without such bristles It' 



10. Wings slightly notched at the end of the first longitudinal. .. . 



ptoduvta Walker. 



Wings without such notches 11 



11 . Chest with two gray stripes transversa Walkei-. 



Chest without such stripes 1- 



lli. Upper side of thorax with five fine brown lines. . .scalaris Low. 



Upper side of thorax with fewer or no vitta' 



quadrisctosii Thoiuson. 



argentata. See Brachydeutera. 



avia Lw. 78L193, 78OS200, 78K244, <tr,B2(>S, OoAG'J:]. 



Hudson Bay Territory, 

 bella Lw. 62L133, 7SOS200, 96B269, 0r)A623. Middle 



States. 

 bellula Will. 96W390, 96S291, 05A623. St. Vincent. 

 ircvicornis. See Hyadina nitida. 

 carinata Lw. 62L137, 78OS200, 96B269, 0r)A()23. Middle 



States, New Jersey, 

 decorata Will. 96W389, 96S291, 05A623. St. Vincent, 

 decoris Will. 93W258, 93S231, 05A623. Panamint A'alley 



(California) . 

 erythrocera Lw. 78L194. 7SK244. 78OS201. 9r.R2(i9. 



05A623. C)d>n. 

 finttata. See Hyadina. 



guttata var. brevicornis. See Hyadina nitida. 

 macrochaeta Lw. 78L192. 78OS200, 78K244. 9r,B2rt!>. 



05A623. Texas, 

 producta Walk. 49W1099. 78OS201, 96B266, 05A623. 



Hudson Bay. 

 pulchrifrons Lw. 72L102. 72L84, 72R389, 78OS200. 

 90B269, 97W52, 0.".Ar,2:'.. Texas. 



